I fixed the undo/redo bahavior, added board backgrounds and dark mode.

It is a desktop app to manage solo projects as kanban boards, with a simple markdown file as a backend. It is offline first (for the most part, actually the background feature is online only for now). It only runs on linux for now. It is free to use, but not open source for now. I use it every day.
The logic of undo redo is now a little bit more sensible. If you have a card or section opened, do some edits and press undo/redo, only edits to the current card will be changed.
If you then close the card and undo, the whole edit is undone.
Before I tried to deal with both in one undo stack and that made things very complicated.
If you add an image before the first h2 of your markdown file, it will be taken as a background image for the board.
Try some of those for example



Note that for now the picture must be hosted online, relative paths won't work.
The little button at the top right near the search lets you switch between light and dark mode.
The app now remembers what your scroll position was on the board last time you closed it, so you are no longer sent back to the left side of the board when it refreshes or when switching tabs.
Head to https://kanbanmd.lecaro.me/ and download the linux binary, a deb or rpm. If you are still using trello, make a json export of your board and use the tool at the bottom of the page to convert it to markdown.
Happy hacking.
Renan